Flying LX/SK/LO out of T5 you can use the LX, WFS (aka Worldwide VIP, need to collect a pass from the LO CI desk) and the SK lounge.
http://www.flychicago.com/ohare/abou...52008FINAL.pdf
The SK facilites are the best. The Swiss lounge is a blast from the past, barely converted from the Swissair design.